Screen printing apparatus

Abstract

A screen printing apparatus has a base frame 1 in the shape of a convex-rectangle, four, tensioning rods 2 attached a printing screen fabric 5, four pair of collars 4 and four pair of bearing blocks 3. The bearing blocks 3 are attached to the base frame 1 to hold the tensioning rods 2 in place. The tensioning rods 2 are rotated in a predetermined direction to increase tension of the printing screen fabric 5. The collars 4 lock the tensioning rods in place.

What is claimed is: 
     
       1. A screen printing apparatus for tensioning a printing area within a printing screen comprising: a base frame having an upper curved section spaced apart from a lower curved section and a left curved section spaced apart from a right curved section, wherein said upper and lower curved sections and said left and right curved sections extend outward from each other, respectively, to form a substantially rectangular shape having convex sides;   upper, lower, left and right tensioning rods positioned adjacent said upper, lower, left and right convex sections, respectively, wherein said upper tensioning rod is positioned substantially parallel to said lower tensioning rod and said left tensioning rod is positioned substantially parallel to said right tensioning rod such that said upper, lower, left and right tensioning rods form a substantially rectangular shape and wherein said upper, lower, left and right tensioning rods are adapted for attachment of said printing screen;   locking means for keeping said upper, lower, left and right tensioning rods in place; and   holding means for enabling rotation of said upper, lower, left and right tensioning rods   wherein said upper, lower, left angle right tensioning rods are selectively rotated in a predetermined direction to increase tension in said printing area.   
     
     
       2. A screen printing apparatus according to claim 1, wherein said locking means includes a collar. 
     
     
       3. A screen printing apparatus according to claim 1, wherein said upper, lower, left and right tensioning rods each include flats at ends thereof. 
     
     
       4. A screen printing apparatus according to claim 1, wherein said locking means is attached to said base frame.